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(Unicode C) Verify JWT Using HS256, HS384, or HS512Demonstrates how to verify a JWT that was signed using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) This example verifies the signature. It also does the following:
#include <C_CkJwtW.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { HCkJwtW jwt; const wchar_t *token; BOOL sigVerified; int leeway; BOOL bTimeValid; const wchar_t *payload; HCkJsonObjectW json; BOOL success; const wchar_t *joseHeader; // Demonstrates how to verify an HMAC JWT using a shared secret (password). // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. jwt = CkJwtW_Create(); token = L"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDYzNDMxODEyLCJuYmYiOjE0NjM0MzE4MTIsImV4cCI6MTQ2MzQzNTQxMn0.SHnMJ11qJH5pbp22YchT_9fL2HIx0koHiUHLG67_foU"; // First verify the signature. // The password used to create this JWT was "secret". sigVerified = CkJwtW_VerifyJwt(jwt,token,L"secret"); wprintf(L"with correct password: %d\n",sigVerified); // Now try with a different password: sigVerified = CkJwtW_VerifyJwt(jwt,token,L"secret2"); wprintf(L"with incorrect password %d\n",sigVerified); // Let's see if the time constraints, if any, are valid. // The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour. // If the current system time is before the "nbf" time, or after the "exp" time, // then IsTimeValid will return false/0. // Also, we'll allow a leeway of 60 seconds to account for any clock skew. // Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true. leeway = 60; bTimeValid = CkJwtW_IsTimeValid(jwt,token,leeway); wprintf(L"time constraints valid: %d\n",bTimeValid); // Now let's recover the original claims JSON (the payload). payload = CkJwtW_getPayload(jwt,token); // The payload will likely be in compact form: wprintf(L"%s\n",payload); // We can format for human viewing by loading it into Chilkat's JSON object // and emit. json = CkJsonObjectW_Create(); success = CkJsonObjectW_Load(json,payload); CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); // We can recover the original JOSE header in the same way: joseHeader = CkJwtW_getHeader(jwt,token); // The payload will likely be in compact form: wprintf(L"%s\n",joseHeader); // We can format for human viewing by loading it into Chilkat's JSON object // and emit. success = CkJsonObjectW_Load(json,joseHeader); CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); CkJwtW_Dispose(jwt); CkJsonObjectW_Dispose(json); } |
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